Relation of Stimulus Rate to
Degree of Sympathetic and Parasympathetic Effect
A special difference between the autonomic nervous system and the
skeletal nervous system is that only a low frequency of stimulation is required
for full activation of autonomic effectors. In general, only one nerve impulse
every few seconds suffices to maintain normal sympathetic or parasympathetic
effect, and full activation occurs when the nerve fibers discharge 10 to 20
times per second. This compares with full activation in the skeletal nervous system
at 50 to 500 or more impulses per second.
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